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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2017-04-24 to 2017-05-04
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.4 (Vapour Pressure)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7950 (Vapor Pressure)
Deviations:
no
GLP compliance:
no
Type of method:
effusion method: Knudsen cell
Key result
Test no.:
#1
Temp.:
20 °C
Vapour pressure:
0 Pa
Key result
Test no.:
#2
Temp.:
25 °C
Vapour pressure:
0.001 Pa
Key result
Test no.:
#3
Temp.:
50 °C
Vapour pressure:
0.025 Pa

The vapour pressure was measured twice. The first measurement was performed in the temperature range of 70 °C to 120 °C. However above 90 °C the vapour pressure was too high for further measurements. The second measurement was therefore performed in the temperature range of 30 °C to 70 °C.

  

Temperature / °C

Vapour pressure / hPa

30

2.7E-5

40

3.2E-5

50

2.9E-4

60

1.0E-3

70

2.8E-3

70

3.2E-3

80

9.5E-3

90

2.4E-2

 

 

Antoine parameters and extrapolated vapour pressures 

T / ° C

p / hPa

log (p/hPa) = A + B/(C+T[°C])

20

3.6E-6

A = 14.44513

25

7.7E-6

B = -5831.25

50

2.5E-4

C = 273.15

The values for 20, 25 and 50 °C are calculated, using the Antoine constants A, B and C

 

  

T/°C

p/hPa

p/ Pa

20

3.6E6

3.6E-4

25

7.7E-6

7.7E-4

50

2.5E-4

2.5E-2

Conclusions:
The vapour pressure at 20, 25 and 50 °C was determined to be 0.0004, 0.00077 and 0.025 Pa respectively.
Executive summary:

A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item. The vapour pressure of the test item was determined at different temperatures (30 - 90 °C) using the effusion method (weight loss). The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The values for 20, 25 and 50 °C were calculated using the Antoine equation. The vapour pressure was calculated to be 0.00036 Pa at 20 °C and 0.00077 Pa at 25 °C respectively.

Description of key information

The vapour pressure at 20, 25 and 50 °C was determined to be 0.0004, 0.00077 and 0.025 Pa respectively.

Key value for chemical safety assessment

Vapour pressure:
0.001 Pa
at the temperature of:
25 °C

Additional information

A study was conducted according to OECD TG 104, Regulation (EC) No 440/2008 method A.4 and OPPTS 830.7950 to determine the vapour pressure of the test item (reference 4.6 -1). The vapour pressure of the test item was determined at different temperatures (30 - 90 °C) using the effusion method (weight loss). The vapour pressure was calculated using the linear regression equation of the Log P versus 1/T function. The values for 20, 25 and 50 °C were calculated using the Antoine equation. The vapour pressure was calculated to be 0.00036 Pa at 20 °C and 0.00077 Pa at 25 °C respectively.